CN116105074B - High-pressure nitrogen gas supply device and control method thereof - Google Patents
High-pressure nitrogen gas supply device and control method thereof Download PDFInfo
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- CN116105074B CN116105074B CN202211564182.6A CN202211564182A CN116105074B CN 116105074 B CN116105074 B CN 116105074B CN 202211564182 A CN202211564182 A CN 202211564182A CN 116105074 B CN116105074 B CN 116105074B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 893
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910001873 dinitrogen Inorganic materials 0.000 title claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 441
- 239000007788 liquid Substances 0.000 claims abstract description 261
- 230000008016 vaporization Effects 0.000 claims abstract description 130
- 239000007789 gas Substances 0.000 claims abstract description 125
- 238000009834 vaporization Methods 0.000 claims abstract description 122
- 230000005540 biological transmission Effects 0.000 claims abstract description 58
- 239000006200 vaporizer Substances 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000010257 thawing Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
Abstract
The invention provides a high-pressure nitrogen gas supply device and a control method thereof, wherein the device comprises: the liquid nitrogen storage tank stores liquid nitrogen medium and provides the liquid nitrogen medium to the low-temperature module; the pre-cooling loop is arranged between the liquid nitrogen storage tank and the low-temperature module and is used for pre-cooling the high-pressure nitrogen supply device; the low-temperature module is connected with the liquid nitrogen storage tank, acquires a liquid nitrogen medium in the liquid nitrogen storage tank according to a preset flow, pressurizes the liquid nitrogen medium, and pumps the liquid nitrogen medium into the vaporization module; the vaporization module is connected with the low-temperature module, vaporizes a liquid nitrogen medium pumped by the low-temperature module into nitrogen, and outputs the nitrogen to the high-pressure nitrogen cylinder group and external equipment through the gas transmission pipeline; the high-pressure nitrogen cylinder group comprises a plurality of high-pressure nitrogen cylinders which are connected with the gas transmission pipeline and buffer and store nitrogen provided by the vaporizer into the gas transmission pipeline; and providing nitrogen output through the gas transmission pipeline for external equipment to call nitrogen during the starting of the nitrogen supply device.
Description
Technical Field
The invention relates to the field of aerospace, in particular to a high-pressure nitrogen supply device and a control method thereof.
Background
The test of the carrier rocket power system needs to simulate the working state of the rocket in a target range for deferring 24h to launch, and the blowing off and gas sealing gas is supplied to the rocket and the engine continuously during the period, so that the gas consumption of one test, particularly the nitrogen consumption, is very large. Taking a rocket boosting of a certain model as an example, considering that the nitrogen consumption amount in the 24h ignition state is up to 55000Nm < 3 >, the requirement of nitrogen gas supply capacity is obviously increased. The most common mode of nitrogen supply for the test bed and the target range at present is two modes of gas cylinder gas storage supply and liquid nitrogen vaporization real-time supply. The two methods have the defects in the actual construction and system operation processes. The method comprises the following steps:
1. because the nitrogen gas consumption of the carrier rocket of a certain model is large, a gas cylinder gas storage supply mode is adopted, the system reliability is high, the use technology is mature, but the number of high-pressure gas storage cylinders is more in demand, and the test cost is greatly increased.
2. The liquid nitrogen vaporization real-time supply mode is adopted, equipment is numerous, equipment with severe requirements on the running environment such as a low-temperature pump and a vaporizer is relatively poor in reliability, and common problems such as pump body vibration, impact and cavitation exist, and the vaporizer continuously works for a long time to cause the reduction of heat exchange capacity and the like. The above problems may lead to a risk of the supply of air stopping if they occur.
Therefore, a high-pressure high-flow nitrogen real-time supply method for rocket power system test is needed in the industry, and the high-pressure high-flow nitrogen real-time supply method can improve the system reliability and reduce the test cost.
Disclosure of Invention
The invention aims to provide a high-pressure nitrogen supply device and a control method thereof, which are used for executing corresponding nitrogen supply according to the requirement of high-flow nitrogen output, and simultaneously, the stability and the reliability of a gas supply structure are ensured, and meanwhile, the equipment cost is greatly saved.
In order to achieve the purpose, the high-pressure nitrogen supply device provided by the invention comprises a liquid nitrogen storage tank, a low-temperature module, a vaporization module, a high-pressure nitrogen cylinder group, a precooling loop and a gas transmission pipeline; the liquid nitrogen storage tank is used for storing liquid nitrogen medium and providing the liquid nitrogen medium to the low-temperature module; the pre-cooling loop is arranged between the liquid nitrogen storage tank and the low-temperature module and comprises a reflux valve and a liquid discharge valve; the liquid nitrogen pre-cooling system comprises a liquid nitrogen storage tank, a liquid nitrogen return inlet, a liquid nitrogen return valve and a liquid nitrogen return valve, wherein the liquid nitrogen return inlet of the liquid nitrogen storage tank is connected with the liquid nitrogen return valve; when the liquid discharge valve is closed, controlling liquid nitrogen to flow back to the liquid nitrogen storage tank through the backflow valve so as to adjust the pressure value in the precooling loop; the low-temperature module is connected with the liquid nitrogen storage tank and is used for acquiring the liquid nitrogen medium in the liquid nitrogen storage tank according to a preset flow, pressurizing the liquid nitrogen medium and then pumping the liquid nitrogen medium into the vaporization module; the vaporization module is connected with the low-temperature module and is used for vaporizing the liquid nitrogen medium pumped by the low-temperature module into nitrogen and outputting the nitrogen to the high-pressure nitrogen cylinder group and external equipment through the gas transmission pipeline; the high-pressure nitrogen cylinder group comprises a plurality of high-pressure nitrogen cylinders which are connected with the gas transmission pipeline and are used for buffering and storing the nitrogen provided by the vaporization module into the gas transmission pipeline; and providing nitrogen output through the gas transmission pipeline for external equipment to call nitrogen during the starting of the nitrogen supply device.
In the high-pressure nitrogen supply device, preferably, the device further comprises a self-pressurization pipeline, wherein the self-pressurization pipeline comprises a pressurization valve and a pressurization vaporizer, and the pressurization valve and the pressurization vaporizer are connected in series and then connected with the liquid nitrogen storage tank for controlling the pressure value in the liquid nitrogen storage tank in a combined way.
In the high-pressure nitrogen gas supply device, preferably, the liquid nitrogen tank is subjected to a liquid nitrogen medium heat-insulating treatment by vacuum powder.
In the high-pressure nitrogen supply device, preferably, the low-temperature module is one or more low-temperature variable-frequency plunger pumps connected in parallel; the liquid nitrogen input port of the low-temperature variable-frequency plunger pump is connected with the liquid nitrogen output port of the filter, and the low-temperature variable-frequency plunger pump is used for carrying out pressurizing treatment on the liquid nitrogen medium.
In the high-pressure nitrogen supply device, preferably, the inlet pressure of the low-temperature variable-frequency plunger pump is 0.02Mpa to 0.6Mpa, and the outlet pressure is 23Mpa; the preset flow rate is 8 cubic meters per hour.
In the high-pressure nitrogen supply device, preferably, the vaporization module is one or more parallel vaporizers; the liquid nitrogen input port of the vaporizer is connected with the liquid nitrogen output port of the low-temperature variable-frequency plunger pump, and the vaporizer is used for vaporizing the liquid nitrogen medium into nitrogen.
In the high-pressure nitrogen gas supply device, preferably, the operating pressure of the vaporizer is 23Mpa; the flow rate of the vaporized liquid nitrogen is 8 cubic meters per hour; the vaporizer eliminates frosting caused by the liquid nitrogen medium through natural defrosting and/or electric heating defrosting.
In the high-pressure nitrogen supply device, preferably, the device further comprises an inflation module, wherein the inflation module comprises one or more inflation valves, and the inflation valves are connected with the nitrogen output port of the vaporizer and are used for transmitting the nitrogen output by the vaporizer into the gas transmission pipeline.
In the above high-pressure nitrogen supply device, preferably, a gas compensating valve is provided between the gas transmission pipeline and the high-pressure nitrogen cylinder group, and a nitrogen output port for supplying gas to external equipment by the gas transmission pipeline is provided with a gas transmission valve; when the air supplementing valve is opened and the air supplying valve is closed, nitrogen output by the vaporization module is supplemented to the high-pressure nitrogen cylinder group; when the air supplementing valve is closed and the air supplying valve is opened, the vaporization module outputs the air to external equipment.
In the high-pressure nitrogen supply device, preferably, the device further comprises a control module, wherein the control module is used for monitoring the nitrogen output of the gas transmission pipeline and the liquid nitrogen vaporization amount of the vaporization module, and controlling the high-pressure nitrogen cylinder group and/or the vaporization module to input nitrogen into the gas transmission pipeline according to the nitrogen output and the liquid nitrogen vaporization amount.
In the above high-pressure nitrogen supply device, preferably, the low-temperature module includes a first variable frequency plunger pump and a second variable frequency plunger pump, the vaporization module includes a first vaporizer and a second vaporizer, the high-pressure nitrogen supply device further includes a first filter, a second filter, a total liquid outlet valve, a first branch liquid outlet valve, a second branch liquid outlet valve, a first branch charging valve, a second branch charging valve, an air supply valve and a total charging valve, the total liquid outlet valve is connected with the liquid nitrogen storage tank, the first branch liquid outlet valve, the first filter, the first variable frequency plunger pump, the first vaporizer and the first branch charging valve are connected in series to form a first branch, the second branch liquid outlet valve, the second filter, the second variable frequency plunger pump, the second vaporizer and the second branch charging valve are connected in series to form a second branch, the first branch is connected with the total liquid outlet valve and the total charging valve in parallel after being connected with the second branch, and the first branch is connected with the air supply valve and the air supply pipe respectively, and the air supply valve is connected with the air supply pipe and the air supply pipe.
The invention also provides a control method suitable for the high-pressure nitrogen supply device, which comprises the following steps: according to the received command, liquid nitrogen is injected into the liquid nitrogen storage tank, after the liquid nitrogen in the liquid nitrogen storage tank is injected to a preset volume, the low-temperature module is closed, and liquid nitrogen medium is injected into the pre-cooling loop through the liquid nitrogen storage tank to pre-cool the pipeline and the low-temperature module; when the temperature and pressure values between the pre-cooling loop and the low-temperature module accord with a preset temperature and pressure threshold value, starting the low-temperature module to carry out pressurizing treatment on the liquid nitrogen medium flowing in the pre-cooling loop according to a preset flow, and pumping the liquid nitrogen medium after the pressurizing treatment into the vaporization module; the vaporization module vaporizes the pumped liquid nitrogen medium into nitrogen and stores the nitrogen into the high-pressure nitrogen cylinder group; and monitoring the nitrogen output of the gas transmission pipeline and the liquid nitrogen vaporization amount of the vaporization module, and controlling the high-pressure nitrogen cylinder group and/or the vaporization module to input nitrogen into the gas transmission pipeline according to the nitrogen output and the liquid nitrogen vaporization amount.
In the above control method, preferably, monitoring the nitrogen output of the gas transmission pipeline and the liquid nitrogen vaporization amount of the vaporization module, and controlling the high-pressure nitrogen cylinder group and/or the vaporization module to input nitrogen into the gas transmission pipeline according to the nitrogen output and the liquid nitrogen vaporization amount includes: when the nitrogen output is lower than or equal to a preset first threshold value and the liquid nitrogen vaporization amount is lower than a preset second threshold value, inputting nitrogen to the gas transmission pipeline through the high-pressure nitrogen cylinder group to the preset first threshold value; when the nitrogen output is lower than a preset first threshold, and the liquid nitrogen vaporization amount is higher than a preset second threshold and lower than a preset third threshold, nitrogen is input to the gas transmission pipeline through the high-pressure nitrogen cylinder group and the vaporization module to the preset first threshold; when the nitrogen output is lower than a preset first threshold and the liquid nitrogen vaporization quantity is higher than a preset third threshold, after the nitrogen provided by the vaporization module is buffered by the high-pressure nitrogen cylinder group, inputting the nitrogen to the gas transmission pipeline by the high-pressure nitrogen cylinder group to the preset first threshold; and when the nitrogen output quantity is equal to a preset first threshold value, the liquid nitrogen vaporization quantity is higher than a preset third threshold value and the capacity of the high-pressure nitrogen cylinder group reaches a threshold value, adjusting the liquid nitrogen vaporization efficiency of the vaporization module to enable the liquid nitrogen vaporization quantity to be equal to or smaller than a preset second threshold value.
The beneficial technical effects of the invention are as follows: the method has the advantages of large conveying flow and good economy of the liquid nitrogen vaporization supply mode, and meanwhile, the advantages of the gas cylinder gas supply mode are fully used for controlling risks in the aspects of equipment, technology and the like, so that a set of guarantee method for improving the reliability of the vaporization mode is formed. Not only has good economy, but also improves the reliability and the safety of the whole device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a high-pressure nitrogen supply device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an application structure of a high-pressure nitrogen supply device according to an embodiment of the present invention;
fig. 3 is a flow chart of a control method according to an embodiment of the invention.
Wherein the above figures include the following reference numerals:
1. a liquid nitrogen storage tank; 2. a total liquid outlet valve; 3. a liquid outlet valve of the branch 1; 4. a branch 2 liquid outlet valve; 5. a liquid nitrogen pump; 6. a liquid discharge valve; 7. a vaporization module; 8. a branch 2 inflation valve; 9. a branch 1 inflation valve; 10. a total inflation valve; 11. a gas supply valve; 12. a pressure increasing valve; 13. a booster vaporizer; 14. a return valve; 15. a nitrogen cylinder group; 16. a first filter; 17. and a second filter.
Detailed Description
The following will describe embodiments of the present invention in detail with reference to the drawings and examples, thereby solving the technical problems by applying technical means to the present invention, and realizing the technical effects can be fully understood and implemented accordingly. It should be noted that, as long as no conflict is formed, each embodiment of the present invention and each feature of each embodiment may be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
Additionally, the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that herein.
Referring to fig. 1, the high-pressure nitrogen supply device provided by the invention comprises a liquid nitrogen storage tank, a low-temperature module, a vaporization module, a high-pressure nitrogen cylinder group, a precooling loop and a gas transmission pipeline; the liquid nitrogen storage tank is used for storing liquid nitrogen medium and providing the liquid nitrogen medium to the low-temperature module; the pre-cooling loop is arranged between the liquid nitrogen storage tank and the low-temperature module and comprises a reflux valve and a liquid discharge valve; the liquid nitrogen pre-cooling system comprises a liquid nitrogen storage tank, a liquid nitrogen return inlet, a liquid nitrogen return valve, a liquid nitrogen return inlet, a liquid nitrogen return valve and a liquid nitrogen return valve, wherein the liquid nitrogen return inlet of the liquid nitrogen storage tank is connected with the liquid nitrogen return valve; when the liquid discharge valve is closed, controlling liquid nitrogen to flow back to the liquid nitrogen storage tank through the backflow valve so as to adjust the pressure value in the precooling loop; the low-temperature module is connected with the liquid nitrogen storage tank and is used for acquiring the liquid nitrogen medium in the liquid nitrogen storage tank according to a preset flow, pressurizing the liquid nitrogen medium and then pumping the liquid nitrogen medium into the vaporization module; the vaporization module is connected with the low-temperature module and is used for vaporizing the liquid nitrogen medium pumped by the low-temperature module into nitrogen and outputting the nitrogen to the high-pressure nitrogen cylinder group and external equipment through the gas transmission pipeline; the high-pressure nitrogen cylinder group comprises a plurality of high-pressure nitrogen cylinders which are connected with the gas transmission pipeline and are used for buffering and storing the nitrogen provided by the vaporization module into the gas transmission pipeline; and providing nitrogen output through the gas transmission pipeline for external equipment to call nitrogen during the starting of the nitrogen supply device.
In the above embodiment, the liquid nitrogen storage tank is subjected to liquid nitrogen medium heat insulation treatment by vacuum powder. The low-temperature module is one or more low-temperature variable-frequency plunger pumps connected in parallel; the liquid nitrogen input port of the low-temperature variable-frequency plunger pump is connected with the liquid nitrogen output port of the filter, and the low-temperature variable-frequency plunger pump is used for carrying out pressurizing treatment on the liquid nitrogen medium; the inlet pressure of the low-temperature variable-frequency plunger pump is 0.02Mpa to 0.6Mpa, and the outlet pressure is 23Mpa; the preset flow rate is 8 cubic meters per hour. The vaporization module is one or more parallel evaporators; the liquid nitrogen input port of the vaporizer is connected with the liquid nitrogen output port of the low-temperature variable-frequency plunger pump, and the vaporizer is used for vaporizing the liquid nitrogen medium into nitrogen; and the working pressure of the vaporizer is 23Mpa; the flow rate of the vaporized liquid nitrogen is 8 cubic meters per hour; the vaporizer eliminates frosting caused by the liquid nitrogen medium through natural defrosting and/or electric heating defrosting.
Specifically, in actual work, the high-pressure nitrogen supply device provided by the invention adopts a mode of combining gas storage supply of a gas cylinder and vaporization supply of liquid nitrogen; mainly comprises a liquid nitrogen storage tank, a low-temperature pump, a vaporizer, a high-pressure nitrogen cylinder group, a valve, a pipeline and accessories thereof.
Wherein, liquid nitrogen storage tank: the device is mainly used for storing liquid nitrogen medium and providing rated flow of liquid nitrogen for the cryogenic pump. The liquid nitrogen storage tank volume of the system is 90m 3 The working pressure is 1Mpa, a vacuum powder heat insulation mode is selected, and autogenous pressurization is adopted.
Cryogenic pump: adopts a low-temperature variable-frequency plunger pump, and the liquid nitrogen delivery flow rate is 8m 3 And/h, the inlet pressure of the pump is 0.02-0.6 Mpa, the outlet pressure is 23Mpa, and the pump can continuously work for 24 hours.
A vaporizer: vaporizing high-pressure liquid nitrogen into high-pressure nitrogen, wherein the working pressure of the vaporizer is 23Mpa, and the flow rate of the vaporized liquid nitrogen of the vaporizer is 8m 3 And/h, the device can continuously work for 24 hours, and natural defrosting and electric heating defrosting are adopted.
High pressure nitrogen group: total reserve 160m 3 Adopts 8V 20m 3 And a PN23MPa gas cylinder is used as a buffer gas cylinder group for gas storage.
During operation, liquid nitrogen is conveyed to the low-temperature pump through the conveying pipeline, liquid nitrogen pressurization is carried out, then the liquid nitrogen is vaporized into normal-temperature nitrogen through the vaporizer, the normal-temperature nitrogen is conveyed to the high-pressure nitrogen cylinder through the nitrogen conveying pipeline, and the high-pressure nitrogen cylinder group is filled. In order to prevent the risk of gas interruption, under the normal condition of the test (without delay and without emergency shutdown during the test), 8 nitrogen cylinder groups are used for supplying gas on the same day of the test, so that the nitrogen requirements of the vertical test stage and the test stage can be met, and the nitrogen requirement deficiency part in the post-test treatment stage can be met by starting a liquid nitrogen vaporization system and supplying nitrogen in real time; when the test is delayed or the test period is in an emergency shutdown state, when the pressure of the nitrogen cylinder is lower than the test termination pressure, a liquid nitrogen vaporization system is started, the gas cylinder gas supply mode is switched to a vaporization gas supply mode, and nitrogen is supplied in real time.
Meanwhile, in order to improve the reliability of the device, the system adopts a redundant design, is provided with two or more sets of cryogenic pumps and evaporators, and is used in parallel, and one is used for one, and the other is used whenWhen one set is problematic, the set is switched to the other set, the starting time of the standby vaporization equipment is 20 minutes (from pre-cooling to starting), the buffer gas cylinder group is used for supplying gas during the switching, and the gas supply amount is about 700-800 Nm 3 The pressure of the buffer gas cylinder is reduced by 1MPa, so that the gas source supply is not affected in the switching process of the vaporization equipment, continuous gas supply can be realized, and the maximum gas supply capacity reaches 6400Nm 3 And/h, the maximum air supply pressure is 23MPa.
Referring to fig. 2, in an embodiment of the present invention, the apparatus may further include a self-pressurization pipeline, where the self-pressurization pipeline includes a pressurization valve 12 and a pressurization vaporizer 13, and the pressurization valve 12 and the pressurization vaporizer 13 are connected in series and then connected to the liquid nitrogen storage tank 1, so as to control the pressure value in the liquid nitrogen storage tank in a combined manner. Further, the device also comprises an inflation module, the inflation module comprises one or more inflation valves 8 and 9, and the inflation valves 8 and 9 are connected with a nitrogen output port of the vaporization module 7 and are used for transmitting nitrogen output by the vaporization module 7 into the gas transmission pipeline.
In another embodiment of the present invention, a gas compensating valve (not shown) is disposed between the gas transmission pipeline and the high-pressure nitrogen cylinder group, and a nitrogen output port for supplying gas to external equipment through the gas transmission pipeline is provided with a gas transmission valve 11; when the air supplementing valve is opened and the air supplying valve 11 is closed, the nitrogen output by the vaporization module 7 is supplemented to the high-pressure nitrogen cylinder group; when the air supply valve is closed and the air supply valve 11 is opened, the vaporizing module 7 outputs the air to the external device.
Specifically, referring to fig. 2 again, as a specific embodiment of the present invention, the cryogenic module includes a first variable frequency plunger pump and a second variable frequency plunger pump, the vaporization module includes a first vaporizer and a second vaporizer, the high-pressure nitrogen supply device further includes a first filter, a second filter, a total liquid outlet valve, a first branch liquid outlet valve, a second branch liquid outlet valve, a first branch gas charging valve, a second branch gas charging valve, a gas supply valve and a total gas charging valve, the total liquid outlet valve is connected with the liquid nitrogen storage tank, the first branch liquid outlet valve, the first filter, the first variable frequency plunger pump, the first vaporizer and the first branch gas charging valve are connected in series to form a first branch, the second branch liquid outlet valve, the second filter, the second variable frequency plunger pump, the second vaporizer and the second branch gas charging valve are connected in series to form a second branch, the first branch is connected with the total liquid outlet valve and the total gas charging valve in parallel, and the gas supply pipeline is connected with the total gas charging valve, and the nitrogen cylinder and the gas supply pipeline are connected with the gas supply pipeline.
The structure adopted by the high-pressure nitrogen supply device in actual work can be composed of a liquid nitrogen storage tank 1, a total liquid outlet valve 2, a liquid outlet valve 3 (namely a first branch liquid outlet valve) of a branch 1, a liquid outlet valve 4 (namely a second branch liquid outlet valve) of the branch 2, a liquid nitrogen pump 5 (namely a first variable-frequency plunger pump and a second variable-frequency plunger pump), a liquid discharge valve 6, a vaporization module 7 (namely a first vaporizer and a second vaporizer), an inflation valve 8 (namely a second branch inflation valve) of the branch 2, an inflation valve 9 (namely a first branch inflation valve) of the branch 1, a total inflation valve 10 and an air supply valve 11. Before the liquid nitrogen storage tank 1, the pipeline, the liquid nitrogen pump 5, the vaporization module 7 and the nitrogen cylinder group 15 are used, the liquid nitrogen storage tank 1, the pipeline, the liquid nitrogen pump and the nitrogen cylinder group 15 are required to be replaced by nitrogen, dew point detection is carried out at the same time, and liquid nitrogen can be filled into the liquid nitrogen storage tank to be put into normal use after the dew point is qualified. After the liquid nitrogen storage tank is filled, precooling is carried out by using a precooling module (a liquid discharge valve 6 and a backflow valve 14), the total liquid discharge valve 2, the liquid discharge valve 3 of the branch 1 and the liquid discharge valve 6 are opened, when a large amount of liquid nitrogen is discharged from a liquid discharge port of the liquid discharge valve 6, the liquid discharge valve 6 is closed, and the backflow valve 14 is opened. After the device is precooled, when the pressure of the inlet of the pump is in the range of 0.02-0.6 MPa, a low-temperature pump is started, the charging valve 9 of the branch 1 and the total charging valve 10 are opened, the reflux valve 14 is closed, liquid nitrogen is conveyed to the vaporization module 7, the nitrogen cylinder group is charged with gas after the liquid nitrogen is vaporized, the gas is charged to 22MPa, the nitrogen is used for supplying nitrogen in the ignition stage of the test day, and the liquid nitrogen pump 5 is closed at the moment. When the test is delayed or the pressure of the gas cylinder group is lower than the final pressure of 8MPa, the liquid nitrogen pump 5 is started to supply gas in real time, and at the moment, the nitrogen cylinder group is used as a buffer gas cylinder. When the nitrogen cylinder group pressure was 22MPa, the liquid nitrogen pump 5 was turned off. If abnormality occurs in the liquid nitrogen pump 5 and the vaporization module 7 in the real-time air supply process, the other branch liquid nitrogen pump and the vaporizer are started to perform real-time air supply.
In an embodiment of the present invention, the high-pressure nitrogen supply device may further include a control module, where the control module is configured to monitor a nitrogen output of the gas transmission pipeline and a liquid nitrogen vaporization amount of the vaporization module, and control the high-pressure nitrogen cylinder group and/or the vaporization module to input nitrogen into the gas transmission pipeline according to the nitrogen output and the liquid nitrogen vaporization amount. Further, the control module can be further used for monitoring the nitrogen storage amount in the high-pressure nitrogen cylinder group and further accurately controlling the high-pressure nitrogen cylinder group and/or the vaporization module to input nitrogen into the gas transmission pipeline based on the nitrogen storage amount; in practical operation, the specific control flow and logic of the control module will be described in detail in the following embodiments, which will not be described in detail herein.
Referring to fig. 3, the present invention further provides a control method suitable for the high-pressure nitrogen supply device, the method includes:
s301, injecting liquid nitrogen into the liquid nitrogen storage tank according to the received instruction, closing the low-temperature module after the liquid nitrogen in the liquid nitrogen storage tank is injected to a preset volume, and injecting liquid nitrogen medium into the pre-cooling loop through the liquid nitrogen storage tank to pre-cool the pipeline and the low-temperature module;
s302, when the temperature and pressure values between the pre-cooling loop and the low temperature module accord with a preset temperature and pressure threshold value, starting the low temperature module to carry out pressurizing treatment on the liquid nitrogen medium flowing in the pre-cooling loop according to a preset flow, and pumping the liquid nitrogen medium subjected to the pressurizing treatment into the vaporization module;
s303, the vaporization module vaporizes the pumped liquid nitrogen medium into nitrogen and stores the nitrogen into the high-pressure nitrogen cylinder group;
s304, monitoring the nitrogen output of the gas transmission pipeline and the liquid nitrogen vaporization amount of the vaporization module, and controlling the high-pressure nitrogen cylinder group and/or the vaporization module to input nitrogen into the gas transmission pipeline according to the nitrogen output and the liquid nitrogen vaporization amount.
In the above embodiment, monitoring the nitrogen output of the gas transmission pipeline and the liquid nitrogen vaporization amount of the vaporization module, and controlling the high-pressure nitrogen cylinder group and/or the vaporization module to input nitrogen into the gas transmission pipeline according to the nitrogen output and the liquid nitrogen vaporization amount includes: when the nitrogen output is lower than or equal to a preset first threshold value and the liquid nitrogen vaporization amount is lower than a preset second threshold value, inputting nitrogen to the gas transmission pipeline through the high-pressure nitrogen cylinder group to the preset first threshold value; when the nitrogen output is lower than a preset first threshold, and the liquid nitrogen vaporization amount is higher than a preset second threshold and lower than a preset third threshold, nitrogen is input to the gas transmission pipeline through the high-pressure nitrogen cylinder group and the vaporization module to the preset first threshold; when the nitrogen output is lower than a preset first threshold and the liquid nitrogen vaporization quantity is higher than a preset third threshold, after the nitrogen provided by the vaporization module is buffered by the high-pressure nitrogen cylinder group, inputting the nitrogen to the gas transmission pipeline by the high-pressure nitrogen cylinder group to the preset first threshold; and when the nitrogen output quantity is equal to a preset first threshold value, the liquid nitrogen vaporization quantity is higher than a preset third threshold value and the capacity of the high-pressure nitrogen cylinder group reaches a threshold value, adjusting the liquid nitrogen vaporization efficiency of the vaporization module to enable the liquid nitrogen vaporization quantity to be equal to or smaller than a preset second threshold value.
In actual operation, the working state of the high-pressure nitrogen supply device is mainly judged by utilizing the nitrogen output and the liquid nitrogen vaporization amount, namely, when the high-pressure nitrogen supply device is not completely started, nitrogen can be supplied through the high-pressure nitrogen cylinder group at the moment, when the high-pressure nitrogen supply device is started, but a part of vaporizer in the vaporization module has a fault, and when the liquid nitrogen conversion amount cannot reach the expected value, the high-pressure nitrogen cylinder group and the vaporization module jointly supply nitrogen; when the conversion rate of the vaporization module is higher, the vaporization module can buffer nitrogen into the high-pressure nitrogen cylinder group, and then the high-pressure nitrogen cylinder group provides nitrogen; and when the conversion rate of the vaporization module is higher and the nitrogen stored in the high-pressure nitrogen cylinder group is higher than a preset threshold value, closing part of the vaporizers in the vaporization module to ensure that the vaporization amount of the liquid nitrogen is equal to a preset first threshold value so as to meet the output requirement.
The beneficial technical effects of the invention are as follows: the method has the advantages of large conveying flow and good economy of the liquid nitrogen vaporization supply mode, and meanwhile, the advantages of the gas cylinder gas supply mode are fully used for controlling risks in the aspects of equipment, technology and the like, so that a set of guarantee method for improving the reliability of the vaporization mode is formed. Not only has good economy, but also improves the reliability and the safety of the whole device.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (11)
1. The control method of the high-pressure nitrogen supply device is characterized in that the high-pressure nitrogen supply device comprises a liquid nitrogen storage tank, a low-temperature module, a vaporization module, a high-pressure nitrogen cylinder group, a precooling loop and a gas transmission pipeline;
the liquid nitrogen storage tank is used for storing liquid nitrogen medium and providing the liquid nitrogen medium to the low-temperature module;
the pre-cooling loop is arranged between the liquid nitrogen storage tank and the low-temperature module and comprises a reflux valve and a liquid discharge valve;
the liquid nitrogen pre-cooling system comprises a liquid nitrogen storage tank, a liquid nitrogen return inlet, a liquid nitrogen return valve and a liquid nitrogen return valve, wherein the liquid nitrogen return inlet of the liquid nitrogen storage tank is connected with the liquid nitrogen return valve; when the liquid discharge valve is closed, controlling liquid nitrogen to flow back to the liquid nitrogen storage tank through the backflow valve so as to adjust the pressure value in the precooling loop;
the low-temperature module is connected with the liquid nitrogen storage tank and is used for acquiring the liquid nitrogen medium in the liquid nitrogen storage tank according to a preset flow, pressurizing the liquid nitrogen medium and then pumping the liquid nitrogen medium into the vaporization module;
the vaporization module is connected with the low-temperature module and is used for vaporizing the liquid nitrogen medium pumped by the low-temperature module into nitrogen and outputting the nitrogen to the high-pressure nitrogen cylinder group and external equipment through the gas transmission pipeline;
the high-pressure nitrogen cylinder group comprises a plurality of high-pressure nitrogen cylinders which are connected with the gas transmission pipeline and are used for buffering and storing the nitrogen provided by the vaporization module into the gas transmission pipeline; the nitrogen output is provided through the gas transmission pipeline, so that external equipment can call nitrogen during the starting period of the nitrogen supply device; the method comprises the following steps:
according to the received command, liquid nitrogen is injected into the liquid nitrogen storage tank, after the liquid nitrogen in the liquid nitrogen storage tank is injected to a preset volume, the low-temperature module is closed, and liquid nitrogen medium is injected into the pre-cooling loop through the liquid nitrogen storage tank to pre-cool the pipeline and the low-temperature module;
when the temperature and pressure values between the pre-cooling loop and the low-temperature module accord with a preset temperature and pressure threshold value, starting the low-temperature module to carry out pressurizing treatment on liquid nitrogen medium flowing in the pre-cooling loop according to preset flow, and pumping the pressurized liquid nitrogen medium into the vaporization module;
the vaporization module vaporizes the pumped liquid nitrogen medium into nitrogen and stores the nitrogen into the high-pressure nitrogen cylinder group;
monitoring the nitrogen output of the gas transmission pipeline and the liquid nitrogen vaporization amount of the vaporization module, and controlling the high-pressure nitrogen cylinder group and/or the vaporization module to input nitrogen into the gas transmission pipeline according to the nitrogen output and the liquid nitrogen vaporization amount;
monitoring the nitrogen output of the gas transmission pipeline and the liquid nitrogen vaporization amount of the vaporization module, and controlling the high-pressure nitrogen cylinder group and/or the vaporization module to input nitrogen into the gas transmission pipeline according to the nitrogen output and the liquid nitrogen vaporization amount comprises the following steps:
when the nitrogen output is lower than or equal to a preset first threshold value and the liquid nitrogen vaporization amount is lower than a preset second threshold value, inputting nitrogen to the gas transmission pipeline through the high-pressure nitrogen cylinder group to the preset first threshold value;
when the nitrogen output is lower than a preset first threshold, and the liquid nitrogen vaporization amount is higher than a preset second threshold and lower than a preset third threshold, nitrogen is input to the gas transmission pipeline through the high-pressure nitrogen cylinder group and the vaporization module to the preset first threshold;
when the nitrogen output is lower than a preset first threshold and the liquid nitrogen vaporization quantity is higher than a preset third threshold, after the nitrogen provided by the vaporization module is buffered by the high-pressure nitrogen cylinder group, inputting the nitrogen to the gas transmission pipeline by the high-pressure nitrogen cylinder group to the preset first threshold;
when the nitrogen output is equal to a preset first threshold, the liquid nitrogen vaporization amount is higher than a preset third threshold, and the capacity of the high-pressure nitrogen cylinder group reaches a threshold, the liquid nitrogen vaporization efficiency of the vaporization module is adjusted to enable the liquid nitrogen vaporization amount to be equal to the preset first threshold.
2. The method for controlling a high-pressure nitrogen supply apparatus according to claim 1, wherein the apparatus further comprises a self-pressurizing pipe, the self-pressurizing pipe comprises a pressurizing valve and a pressurizing vaporizer, and the pressurizing valve and the pressurizing vaporizer are connected in series and then connected with the liquid nitrogen storage tank for controlling the pressure value in the liquid nitrogen storage tank in a combined manner.
3. The method for controlling a high-pressure nitrogen gas supply apparatus according to claim 1, wherein said liquid nitrogen tank is subjected to a liquid nitrogen medium heat insulating treatment by vacuum powder.
4. The control method of the high-pressure nitrogen supply device according to claim 1, wherein the low-temperature module is one or more parallel low-temperature variable-frequency plunger pumps; the high-pressure nitrogen supply device further comprises a filter, the filter is arranged between the liquid nitrogen storage tank and the low-temperature module, a liquid nitrogen input port of the low-temperature variable-frequency plunger pump is connected with a liquid nitrogen output port of the filter, and the low-temperature variable-frequency plunger pump is used for carrying out pressurizing treatment on liquid nitrogen media.
5. The method for controlling a high-pressure nitrogen gas supply apparatus according to claim 4, wherein an inlet pressure of said low-temperature variable-frequency plunger pump is 0.02Mpa to 0.6Mpa and an outlet pressure is 23Mpa; the preset flow rate is 8 cubic meters per hour.
6. The method of controlling a high pressure nitrogen gas supply apparatus according to claim 4, wherein said vaporization module is one or more vaporizers connected in parallel; the liquid nitrogen input port of the vaporizer is connected with the liquid nitrogen output port of the low-temperature variable-frequency plunger pump, and the vaporizer is used for vaporizing the liquid nitrogen medium into nitrogen.
7. The control method of a high-pressure nitrogen gas supply apparatus according to claim 6, wherein an operating pressure of said vaporizer is 23Mpa; the flow rate of the vaporized liquid nitrogen is 8 cubic meters per hour; the vaporizer eliminates frosting caused by the liquid nitrogen medium through natural defrosting and/or electric heating defrosting.
8. The method of claim 6, further comprising an inflation module comprising one or more inflation valves coupled to the nitrogen outlet of the vaporizer for delivering nitrogen output from the vaporizer to the gas line.
9. The control method of the high-pressure nitrogen supply device according to claim 1, wherein a gas supply valve is provided between the gas transmission pipeline and the high-pressure nitrogen cylinder group, and a nitrogen output port through which the gas transmission pipeline supplies gas to an external device is provided with a gas transmission valve;
when the air supplementing valve is opened and the air supplying valve is closed, nitrogen output by the vaporization module is supplemented to the high-pressure nitrogen cylinder group;
when the air supplementing valve is closed and the air supplying valve is opened, the vaporization module outputs the air to external equipment.
10. The control method of a high-pressure nitrogen supply device according to claim 1, wherein the device further comprises a control module, the control module is used for monitoring the nitrogen output quantity of the gas transmission pipeline and the liquid nitrogen vaporization quantity of the vaporization module, and the high-pressure nitrogen cylinder group and/or the vaporization module is/are controlled to input nitrogen into the gas transmission pipeline according to the nitrogen output quantity and the liquid nitrogen vaporization quantity.
11. The method according to claim 2, wherein the low temperature module comprises a first variable frequency plunger pump and a second variable frequency plunger pump, the vaporization module comprises a first vaporizer and a second vaporizer, the high pressure nitrogen supply device further comprises a first filter, a second filter, a total liquid outlet valve, a first branch liquid outlet valve, a second branch liquid outlet valve, a first branch gas charging valve, a second branch gas charging valve, a gas supply valve and a total gas charging valve, the total liquid outlet valve is connected with the liquid nitrogen storage tank, the first branch liquid outlet valve, the first filter, the first variable frequency plunger pump, the first vaporizer and the first branch gas charging valve are connected in series to form a first branch, the second filter, the second variable frequency plunger pump, the second vaporizer and the second branch gas charging valve are connected in series to form a second branch gas bottle, and the first branch gas bottle is connected in parallel with the second branch gas charging valve and the total liquid outlet valve and the total gas charging valve respectively, and the gas supply valve is connected with the gas supply pipeline and the gas supply valve are connected respectively.
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